Definition: when something is full or blocked Level: C1
这条高速公路上总是交通拥堵。
There is always traffic ___congestion on this highway.
鼻塞是感冒时的常见症状。
Nasal ___congestion is a common symptom when you have a cold.
大城市的交通拥堵是一个需要紧急解决方案的问题。
The traffic ___congestion in major cities is a problem that needs urgent solutions.
